1 <script type="text/javascript"> 2 function createxmlHttp(){ 3 var xmlhttp; 4 //创建xmlhttp对象 5 if (window.XMLHttpRequest) 6 xmlhttp=new XMLHttpRequest(); 7 else 8 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); 9 } 10 11 function createRequest(){ 12 xmlhttp.onreadystatechange=callbacksuccess //回调函数 13 xmlhttp.open('post',url,true(是否异步)); //发送ajax 14 xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded"); 15 xmlhttp.send(data); //get时data为null 16 } 17 function callbacksuccess() 18 { 19 if (xmlhttp.readyState==4 && xmlhttp.status==200) 20 { 21 // 成功后执行的代码 22 documrnt.getElementById("textarea").value = xmlhttp.responseText; //服务器返回数据为xmlhttp.responseText 23 } 24 } 25 createRequest(); 26 </script>